Loki's made his own share of mistakes, but this was probably the worst one. The forlorn ravenhaired man wept over the lipid corpse of Severus Spane. He couldn't stop the tears from welling up into his perfect feild green eyes.
"What have I done?" Loki asked the empty air. It's not like anyone was around to listen anyway. He was alone, as usual. The man beneath him was dead, killed by his own hand. One of his magical knives had spilled out of his hand as he travelled down the rainbow bridge and had struck this man right in the chest.
A couple of days ago, he wouldn't have cared about the death of this mere mortal, this pathetic human. But, as of last night, he had turned over a new leaf. He didn't want to be a monster any more. The monster that everyone thought he was. The monster inside of him he was trying to forget.
But this man was dead. And it was all his fault.
Once Loki managed to pull himself together, the sky burst in thunder. Oden descended from the rolling grey clods of ominous clouds.
"Father?!" Loki said.
"Loki, Disgraced Prince of Asgard," Oden bellowed, thunderously, "Thou hast killedeth this man. For punishment, thou must learn epmathy. Try to understand the life thou hast so cruelly taken away from this man. As punishment, thou will be forcedeth to complete this man's ultimate dream in life, whatever that may be, before thee are allowedeth to return to our world. To make sure thou completeth the task, Thor and his earth friends will keep an eye on thou."
And so began Loki's bitter punishment, cursed to teach Potions at the Hogwarts School of Witchcraft and Wizardry.